OpenBSD Errata: July 25th, 2018 (execsize)

Errata patches for the kernel have been released for OpenBSD 6.3 and 6.2.
A regular user could trigger a system crash by executing an invalid
ELF binary.
Binary updates for the amd64, i386, and arm64 platforms are available via
the syspatch utility. Source code patches can be found on the respective
errata pages:
https://www.openbsd.org/errata62.html
https://www.openbsd.org/errata63.html
As these affect the kernel, a reboot will be needed after patching.